William p



(No Model.)

NOQ 377,539.

W. P. STOOKER ELBGTRIO BELL.

Patented Feb. 7, 1883,

ATTORNEYS.

UNITED STATES PATENT OFFICE.

WVILLIAM F. STOOKER, OF EUREKA, KANSAS, ASSIGNOR TO WILLIAM H.

BYERS, OF SAME PLACE.

ELECTRIC BELL.

SPECIFICATION forming part of Letters Patent No. 377,539, dated February'7. 1888.

Applicationfiled March 7, 1887. Serial No. 229,962. (No model.)

To-aZZ whom it may concern.-

Be itknown that I, WILLIAM F. STOOKER, of Eureka, in the county ofGreenwood and State of Kansas, haveinvented a new'and Improved ElectricBell, of which the following is a specification, reference being had tothe annexed drawings, forming a part thereof, in which Figure 1 is aside elevation of my improved electric bell. Fig. 2 is a verticalsection taken on line .70 min Fig. 1. Fig. 3 is a vertical transversesection of the end of the armature-lever, taken on line 3/ y in Fig. 2.Fig. 4 is a side elevation of the bushing fitting the armaturelever.Fig. 5 is a plan view of a portion of the forward end of the armature-lever, showing the cross-arms; and Fig. 6 is a plan view of 'the yokeof one of the electromagnetic armatures.

Similar letters of reference indicate corre sponding parts in all theviews.

The object of my invention is to construct an electromagnetic bell inwhich a long stroke of the bell-hammer may be secured, so as to producean effective alarm without the em ployment of spring or weight actuatedmechanism.

My invention consists in the combination, with the bell-hammer lever, ofone or more electromagnetic armatures and oneor more helices adapted toreceive within their coils the electromagnetic armatures, either thearmatures or the helices being carried by the bell-hammer lever.

To the base A, near one end, is secured the U-shaped frame B,providedwith a right-angled arm, 0, and having a double offset branch, D, nearthe base thereof,provided with crossbars a 6. Near the opposite end ofthe frame is secured a standard, F, which supports a bell, G, insuitable position to be operated by the electro-magnetic mechanism.

In the frame Bareinserted screws a, forming the pivots of thearmature-lever E. One end of the armature-lever E projects forward to apoint underneath the bell G, and is provided with a hammer, H. Thehammer end of the armature-lever is reduced in thickness, to allow it tospring forward and strike the bell after the movement of the body of thelever is arrested by the limiting'screw d,inserted in the bar a of thearm D. The downward motion of the hammer end of the lever E is limitedby a screw, 6, inserted in the cross-bar b. The end of thearmature-lever opposite that to which the hammer H is applied isprovided with-a bearing, f, for the bushing g, (shown in detail in Fig.4,) and the said bushing is held in place in the hearing by a cap,h,secured to the arma ture-lever by screws 2.

In the bushing gis received the rounded the armature-lever,andenter ashort distance into the bore of the helices L, in position to be actedupon by the helices when energized by an electric current.

To the armature-lever E, at the opposite side of the fulcrum of the saidlever,is connected a pair of cores, J,similar to the cores J, alreadydescribed. The cores J are attached to an ironyoke, I, and are boredtransversely and received on trunnions formed on the ends of anon-magnetic cross-arm,-k, formed on or carried by the armature-lever.

To the arm 0 of the frame B is secured. an iron plate, j, to which areattached two helices, L, which are similar in connection and arrangementto the helices L, already described. The cores J are provided withbobbins K,and

normally enter a short distance into the bore of the helices in positionto be acted upon by the magnetism developed in the helices when they-aresubjected to'the action of an electric current.

To the armature-lever E,near its fulcrum,is

secured one end of a spiral spring, Z, the oppo site end of which isconnected with a thread wound around the spindle M,passing through thearm 'D. The spring serves to quicken the retrograde movement of thehammer, so that the strokes of the bell may be repeated in quicksuccession. The current from. any source of electricity, entering thebell by the bindingpost m,is conveyed to the helices L by the wire n,and from the helices L by a spiral wire, 0, to the bobbins K on thecores J, and the bobbins K are connected electrically with the helices Lby the spiral wirep. The current finally returns to the remainingbinding post, m, by a spiral wire, (1,. the bobbin K, and the wire r.

The helices L and the bobbins K are wound in opposite directions, so asto produce in the helices and in the cores J poles of opposite name, tosecure the drawing of the cores J into the helices L. In like manner thehelices L and bobbins K are wound in opposite directions, so as tosecure the drawing of the cores J into the helices L.

As my improved bell is designed for heavy work-such asrailroad-signaling, fire and burg lar alarms it is desirable to place itin the local circuit provided with a strong battery, and operate thelocal circuit by means of a relay. As the relay and local-circuitconnections are of the ordinary kin-lit will be unnecessary to enterinto a detailed description of them. By providing along stroke of theelectro-magnet or polarized armature I am enabled to secure a powerfulblow of the ham mer upon the bell.

Should it be desired to produce double strokes on the bell, a forkedarmature-lever will be employed,carrying two hammers, one upon eitherside of the bell. If desirable, the

ordinary Vibratory attachment may be applied to the armature-lever, soas to secure repeated strokes of the hammer upon the bell during thetime contact is formed by thekey by which the alarm is sent.

Having thus fully described myinvention, I elaim'as new and desire tosecure by Letters Patent- 1. In an electric bell, the combination, withthe bell-hammer-operating meehanism,of helices mounted on a plate ofmagnetic material, electromagnetic armatures axiallyin line with thehelices and adapted to enter the helices, and the electric connectionswhereby the polarity of the helices and of the armatures are renderedopposite, substantially as described.

2. In an electric bell, the combination, with the armature-lever E,provided with the bear ingf and cap h, of the bushing g, the iron yokeI, provided with the cylindrical central portion fitted to the bushingg, the cores J ,attached to the yoke I, the bobbins K, carried by thecores J, the helices L, adapted to receive the ends of the cores J, andthe iron plate j, substantially as described.

3. In an electric bell, the combination, with the armature'lever E, ofthe base A, the frame B, provided with the arms 0 D, the limiting screws(1 e, the retractile spring Z, the oppositely-arranged helices L L, theeleet-ro-magnetic cores J J, the bobbins K K, and the electricalconnections, substantially as described.

IVILLIAM F. STOCKER.

Witnesses:

FRANK P. COGSWELL, J. \V. EELLS.

